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A type of flat-panel
display that works by sandwiching a neon/xenon gas mixture between two sealed
glass plates with parallel electrodes deposited on their surfaces. The plates
are sealed so that the electrodes form right angles, creating pixels. When a voltage
pulse passes between two electrodes, the gas breaks down and produces weakly ionized
plasma, which emits UV radiation. The UV radiation activates color phosphors and
visible light is emitted from each pixel.
Also
called "gas discharge display," a flat-screen technology that uses tiny
cells lined with phosphor that are full of inert ionized gas (typically a mix
of xenon and neon). Three cells make up one pixel (one cell has red phosphor,
one green, one blue). The cells are sandwiched between x- and y-axis panels, and
a cell is selected by charging the appropriate x and y electrodes. The charge
causes the gas in the cell to emit ultraviolet light, which causes the phosphor
to emit color. The amount of charge determines the intensity, and the combination
of the different intensities of red, green and blue produce all the colors required. Today,
Plasma displays are becoming more and more popular. Compared to conventional CRT
displays, plasma displays are about one-tenth the thickness--around 4'', and one-sixth
the weight--less than 67 pounds for a 40" display. They use over 16 million
colors and have a 160 degree-viewing angle.
Companies such as Panasonic, Fujitsu,
and Pioneer manufacture plasma displays. Plasma
displays were initially monochrome, typically orange, but color displays have
become very popular and are used for home theater and computer monitors as well
as digital signs.
The plasma technology is similar to the way neon signs work
combined with the red, green and blue phosphor technology of a CRT. Plasma monitors
consume significantly more current than LCD-based monitors.
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